adding nice 'start the walkthrough' link to help

css/app.css

@@ -1618,11 +1618,18 @@ img.wiki-image {
     border-radius: 4px 4px 0 0;
 }
 
-.help-wrap .toc li:last-child a {
+.help-wrap .toc li:nth-last-child(2) a {
     border-bottom: 1px solid #CCC;
     border-radius: 0 0 4px 4px
 }
 
+.help-wrap .toc li.walkthrough a {
+    overflow: hidden;
+    margin-top: 10px;
+    border-bottom: 1px solid #ccc;
+    border-radius: 4px;
+}
+
 .help-wrap .nav {
     position: relative;
 }
@@ -1820,7 +1827,8 @@ img.wiki-image {
             transition: all 200ms;
 }
 
-.modal-actions button:before {
+.modal-actions button:before,
+.walkthrough a:before {
     display: block;
     content: '';
     height: 100px;
@@ -1855,7 +1863,8 @@ img.wiki-image {
 /* Splash Modal
 ------------------------------------------------------- */
 
-.modal-actions button.walkthrough:before {
+.modal-actions button.walkthrough:before,
+.walkthrough a:before {
     background-position: -200px -220px;
 }
 
@@ -2196,6 +2205,7 @@ img.wiki-image {
   .intro-points-add .tooltip-inner::before,
   .intro-areas-add .tooltip-inner::before,
   .intro-lines-add .tooltip-inner::before,
+  .walkthrough a:before,
   .preset-icon-fill.area,
   .modal-actions button:before,
   .map-control .icon,

data/core.yaml

@@ -165,8 +165,8 @@ en:
   splash:
     welcome: Welcome to the iD OpenStreetMap editor
     text: "iD is a friendly but powerful tool for contributing to the world's best free world map. This is development version {version}. For more information see {website} and report bugs at {github}."
-    walkthrough: "Start the walkthrough"
-    start: "Edit now"
+    walkthrough: "Start the Walkthrough"
+    start: "Edit Now"
   source_switch:
     live: live
     lose_changes: "You have unsaved changes. Switching the map server will discard them. Are you sure you want to switch servers?"

data/locales.js

@@ -204,8 +204,8 @@ locale.en = {
     "splash": {
         "welcome": "Welcome to the iD OpenStreetMap editor",
         "text": "iD is a friendly but powerful tool for contributing to the world's best free world map. This is development version {version}. For more information see {website} and report bugs at {github}.",
-        "walkthrough": "Start the walkthrough",
-        "start": "Edit now"
+        "walkthrough": "Start the Walkthrough",
+        "start": "Edit Now"
     },
     "source_switch": {
         "live": "live",

js/id/ui/help.js

@@ -72,6 +72,7 @@ iD.ui.Help = function(context) {
                 .on('click', clickHelp);
 
             toc.append('li')
+                .attr('class','walkthrough')
                 .append('a')
                 .text(t('splash.walkthrough'))
                 .on('click', function() {